Silicone breast pump stopper



FIG. 1 is a front elevational view of a silicone breast pump stopper showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a bottom, front and right side perspective view thereof.

The broken lines in the drawings illustrate portions of the silicone breast pump stopper which form no part of the claimed design. 

CLAIM The ornamental design for a silicone breast pump stopper, as shown and described. 